GFRP复合材料叶片摆振运动表面位移与层间断裂韧性响应

风机GFRP复合材料叶片摆振运动时产生的层间滑动裂纹是叶片破坏的主要诱因之一，应力强度因子K是层间断裂韧性的重要参量，也是表面裂缝安全性评估的重要指标之一。本文在试验基础上提出了由GFRP复合材料叶片表面位移推导K值的新方法，通过试验验证其理论正确性，试验与仿真对比证明了通过叶片摆振运动表面位移来研究层间断裂韧性响应的方法是可行的，为GFRP复合材料风机叶片的强度预测提供了新的思路和方法。

Response of surface displacement and interlayer fracture toughness of GFRP composite blades shimmy

It is one of the main causes of GFRP composite windturbine blades failure that the blade shimmy leads to the formation and growth of interlayer sliding cracks.The stress intensity factor K is an important parameter for the interlayer fracture toughness.It is also one of the important indicators for the safety assessment of surface cracks.On the basis of experiments, a new method for deriving K values from the displacement of the GFRP composite blade surface was proposed in this paper.The correctness of the theory was verified by experiments.It is proved by the comparison between experiment and simulation that it is feasible to study the interlaminar fracture toughness response through the surface displacement of the GFRP composite blades shimmy.This study provides a new idea and method for the strength prediction of GFRP composite windturbine blades.